________，John returned to school from his hometown.
A．The summer vacation being over
B．The summer vacation is over
C．Because the summer vacation over
D．After the summer vacation being over
A

做題時(shí)首先分析句子結(jié)構(gòu)，確定句子類型。此處應(yīng)為獨(dú)立主格結(jié)構(gòu)作為主句的原因，對(duì)主句解釋、說明，故A項(xiàng)正確。B項(xiàng)為完整的句子，兩句間缺少連詞；C項(xiàng)是because引導(dǎo)的原因狀語從句，句中缺少謂語；D項(xiàng)是after引導(dǎo)的時(shí)間狀語從句，謂語動(dòng)詞應(yīng)為was。
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